US 12,235,206 B2
Fire detection apparatus
Hideki Takano, Shibata-gun (JP); Yasuharu Fujiwara, Iwanuma (JP); and Isao Saeki, Kakuda (JP)
Assigned to HOCHIKI Corporation, Tokyo (JP)
Filed by HOCHIKI Corporation, Tokyo (JP)
Filed on Feb. 16, 2023, as Appl. No. 18/170,279.
Application 18/170,279 is a continuation of application No. 17/078,154, filed on Oct. 23, 2020, granted, now 11,614,396.
Application 17/078,154 is a continuation in part of application No. PCT/JP2019/017008, filed on Apr. 22, 2019.
Claims priority of application No. 2018-119710 (JP), filed on Jun. 25, 2018; application No. 2018-136052 (JP), filed on Jul. 19, 2018; application No. 2018-138200 (JP), filed on Jul. 24, 2018; application No. 2018-200276 (JP), filed on Oct. 24, 2018; application No. 2018-240136 (JP), filed on Dec. 21, 2018; and application No. 2019-003212 (JP), filed on Jan. 11, 2019.
Prior Publication US 2023/0228670 A1, Jul. 20, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01N 21/03 (2006.01); G01N 21/53 (2006.01)
CPC G01N 21/0303 (2013.01) [G01N 21/53 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A fire detection apparatus for detecting a fire in a monitored area, the fire detection apparatus being attached to an installation surface of an installation object, the fire detection apparatus comprising:
a detection space in which detection of a detection target is performed;
a detector cover that inhibits ambient light from entering the detection space and covers part of the detection space, wherein the detector cover is configured to allow a gas containing the detection target to flow into and out of the detector cover;
an outer cover coupled to an inner cover, wherein the detector cover is integral to the inner cover or is attached to the inner cover, wherein the gas containing the detection target is flowable into and out of the outer cover and the inner cover;
a light shielding wall inside the inner cover provided to surround the detector cover;
a first opening for allowing gas flowing into the outer cover to flow into the inner cover;
a second opening for allowing gas flowing into the inner cover to flow into the detection space;
an insect screen having a flat plate shape configured to substantially cover an entirety of the second opening; and
a detector body inside the inner cover, provided on an installation surface side of the detector cover, the detector body covering another part of the detection space,
wherein the light shielding wall overlaps a boundary between the detector cover and the detector body when viewed in a direction orthogonal to the installation surface, and
wherein the insect screen, the first opening, and the detector cover are configured such that the insect screen is attachable to and detachable from the detector cover through the first opening when the outer cover is removed from the fire detection apparatus and while the inner cover remains attached to the fire detection apparatus.